Special Offers for Hard-to-Find Materials & Custom Sizes
DLSS supports urgent, non-standard, and corrosion-resistant piping projects with special materials, custom sizes, and flexible inspection requirements.
When Standard Sizes Are Not Enough
Many heat exchanger, shipbuilding, petrochemical, and maintenance projects require materials or sizes that are not easy to find from standard stock. DLSS helps customers handle special material grades, non-standard dimensions, urgent replacement orders, and project inspection requirements.
Urgent replacement and fast sourcing support
Nickel alloy, duplex, titanium, copper nickel available
Custom OD, WT, length, radius, and machining
TPI, PMI, UT, ET, HT, MTC 3.1/3.2 support
Special Materials We Support
Not sure which material is suitable? Send us your working temperature, medium, pressure, and drawing. Our team can help check the possible material options.
Stainless Steel
304 / 304L
316 / 316L
321 / 321H
347 / 347H
310S
904L
Duplex & Super Duplex
S31803 / 2205
S32205
S32750 / 2507
S32760
S31254 / 254SMO
Nickel Alloys
Inconel 600 / 625
Incoloy 800H / 825
Hastelloy C276 / C22
Monel 400
Alloy 20
Nickel 200 / 201
Titanium & Copper Alloys
Titanium Grade 2
C70600
C71500
C68700
C44300
C12200
Custom Sizes & Non-standard Requirements
Based on drawings or technical specifications
| Requirement | DLSS Support |
|---|---|
| Outside Diameter | Custom OD according to project requirements |
| Wall Thickness | Thin-wall and thick-wall options |
| Length | Fixed length, random length, extra-long tubes |
| U Tube Radius | Custom bending radius based on drawing |
| Finned Tube Design | Low fin, spiral fin, corrugated tube options |
| Flange Size | Non-standard thickness, bore, length, facing |
| Tube Sheet | Drilling, machining, drawing-based production |
| Packing | Wooden case, bundle, export seaworthy packing |
Special Supply for Heat Exchanger Projects
Heat Exchanger Tubes
Straight tubes for condensers, boilers, evaporators, and pressure equipment.
U Tubes
Custom bending radius, fixed leg length, stress relief heat treatment, and wooden case protection.
Low Finned Tubes
For heat transfer efficiency improvement in condensers, coolers, and boiler-related equipment.
Tube Sheets
Customized drilling, machining, material matching, and drawing-based production.
Flanges & Fittings
Matching flanges, elbows, reducers, tees, forged fittings, and project piping components.
For replacement projects, DLSS can help match the original material, size, inspection standard, and packing method to reduce project risk.
Inspection & Project Documents Available
| Inspection / Document | Available Support |
|---|---|
| MTC | EN 10204 3.1 / 3.2 |
| PMI | Positive Material Identification |
| UT | Ultrasonic Testing |
| ET | Eddy Current Testing |
| HT | Hydrostatic Test |
| Flattening / Flaring | For tube quality verification |
| Visual Inspection | Surface and dimension checking |
| TPI | BV, SGS, TUV, LR, ABS, DNV etc. |
| Packing Documents | Packing list, photos, marking, shipping documents |
How DLSS Supports Special Projects
Top 7 Types of
Finned tubes are used in heat exchangers, boilers, economizers, air coolers, condensers, evaporators, chillers, heat recovery systems, and industrial heating equipment. Their main purpose is to increase heat transfer area or improve heat transfer performance in a limited space. However, not all finned tubes work in the same way. Some designs improve heat transfer by […]
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Nickel Alloy Steel Seamless
Introduction Nickel alloy steel seamless pipes and tubes are essential materials in demanding industries where components must withstand extreme temperatures, corrosive chemicals, and high pressure. Their seamless structure combined with the superior characteristics of nickel-based alloys makes them the material of choice for chemical processing, petrochemical, marine, power generation, and LNG applications. Nickel-based alloys are […]
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In‑Depth Guide to Finned
Overview & Industry Outlook Finned tubes are rapidly gaining attention in 2025 due to their unmatched ability to enhance thermal transfer efficiency in compact spaces. According to MarketWatch, the finned tube heat exchanger market is projected to reach USD 20+ billion globally, driven by the expanding needs of HVAC systems, power generation, petrochemicals, and industrial […]
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Heat Exchanger Tube Demand
The global heat exchanger market is heating up—literally and economically. With rising demand for energy efficiency, industrial process optimization, and sustainable thermal management, stainless steel heat exchanger tubes are becoming a critical infrastructure material across multiple industries. Recent industry research forecasts a compound annual growth rate (CAGR) of 9.5% through 2032 for the heat exchanger […]
Read MoreTypical Special Requests from Our Customers
| Customer Request | DLSS Response |
|---|---|
| “We need nickel alloy tubes urgently.” | Check stock, mill schedule, and air shipment option |
| “The size is not standard.” | Review drawing and confirm production feasibility |
| “We need U tubes with fixed radius.” | Confirm radius, leg length, heat treatment, and packing |
| “The end user requires TPI.” | Coordinate BV, SGS, TUV, LR, ABS, or DNV inspection |
| “We only need a small quantity.” | Check sample, trial order, or small-batch support |
| “We need replacement tubes for an old exchanger.” | Match material, size, standard, and inspection requirements |
FAQ
Yes. DLSS can support customized OD, wall thickness, length, bending radius, flange dimensions, and drawing-based production.
For special materials or replacement projects, DLSS can check stock, sample availability, or small-batch production based on the requirement.
Yes. DLSS can coordinate third-party inspection such as BV, SGS, TUV, LR, ABS, and DNV according to project requirements.
Please provide material grade, size, quantity, drawing, standard, inspection requirement, delivery time, and destination port.
For urgent replacement or maintenance projects, DLSS can help check stock, production feasibility, packing schedule, and air shipment options.
DLSS can help review the project condition and discuss possible material options, but final material selection should be confirmed by the project engineer or end user.
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